Wilhelm



UNITED STATES,

PATENT serene WILHELM,WOLTERS, OF BOROWITSCHI, RUSSIA.

PROCESS OF CONCENTRATING SULFURIC ACID.

SPECIFICATION forming part of Letters Patent No. 514,983, dated February 20, 1894.

- Application filed November 28, 1893.

To all whom it may concern:

Be it known that I, WILHELM WOLTERS, chemist, a subject of the Emperor of Germany, residing at Borowitschi, in the government of Novgorod, in the Empire of Russia, have invented or discovered a new and useful Improvement in the Process of Making Sulfuric Acid, of which the following is a specification Myinvention relates to that class of wellknown processes for manufacturing or producing sulfuric acid, in which the acid is concentrated in leaden vessels.

Theobject of my invention is to prevent ihe oorrosipn, of such .vesselsby theacid; to

which ehd my improvement consists in adding sulfate of lead to the acid during the process of concentration, in suflicient quantity to saturate the acid with said sulfate,

tion of a smallportion. The separate lead Serial No. 492.267. (No specimens.)

sulfate may be repeatedly re-used in the concentrating vessels.

The apparatus by which my improved process is carried out is of usual well-known construction, and constitutes no part of the subject-matter claimed. It is therefore unnecessary to describe or illustrate it here.

The quantity of lead sulfate required to saturate the acid will necessariIy"vary'somewhat, according to the condition or strength of the acid, but can readily be ascertained by experiment according to the Well-known laws of chemical combination of such substances. 7

What I claim invention is- The herein described process of concentrating sulfuric acid in leaden vessels, which consists in adding sulfate of lead to the acid during the process of concentration to pre l herein-as new and of my own vent the acid from attacking the leaden vessel, substantially as described.

In testimony that I claim the foregoing as my invention I havesigned my namein presence of two subscribing witnesses.

WILHELM WOLTERS.

Witnesses:

EDWARD BILLA, CONsTAN'rIa BOBYLEFF. 

